1427621191 has 2 divisors, whose sum is σ = 1427621192. Its totient is φ = 1427621190.

The previous prime is 1427621177. The next prime is 1427621213. The reversal of 1427621191 is 1911267241.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1427621191 is a prime.

It is a super-4 number, since 4×1427621191⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427621141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713810595 + 713810596.

It is an arithmetic number, because the mean of its divisors is an integer number (713810596).

Almost surely, 2^1427621191 is an apocalyptic number.

1427621191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427621191 is an equidigital number, since it uses as much as digits as its factorization.

1427621191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 1427621191 is about 37783.8747483632. The cubic root of 1427621191 is about 1125.9981110108.

The spelling of 1427621191 in words is "one billion, four hundred twenty-seven million, six hundred twenty-one thousand, one hundred ninety-one".